DANBURY -- The Housman Street man charged with manslaughter in the death of his 20-month-old son last month appeared in court Wednesday and entered a not-guilty plea.

Christian P. Williams, 25, made a brief appearance before Judge Andrew Roraback in Danbury Superior Court. Williams wore a customary orange prison jumpsuit, while some of the friends and family of his victim, 20-month-old Ayden Baskay, donned T-shirts emblazoned with the child's image.

City police arrested Williams on charges of first-degree manslaughter and risk of injury to a child on Oct. 1, two days after emergency responders arrived on Housman Street and found Ayden unresponsive, despite efforts of CPR.

An autopsy later determined he died of blunt force injury to the head with subdural hemorrhaging and the Office of the Chief State Medical Examiner ruled the case a homicide.

An investigation determined Williams inflicted the injuries while baby-sitting Ayden, though police have said little about the events leading to the child's death.

The arrest warrant against Williams has been sealed and prosecutors on Wednesday moved to have search warrants pertaining to the investigation sealed as well.

Williams has been held on a total of $850,000 bond since his Oct. 1 arrest, which also included two probation violation charges.

Williams is being represented by Assistant Public Defender Jeffrey D. Hutcoe in the manslaughter case and Special Public Defender Vicki Hutchinson in the probation violation cases.

Williams had previously been investigated by city police and the state Department of Children and Families for an allegation of child abuse in 2012. No charges resulted from that investigation though the child's mother, Jacqueline Baskay, entered into an agreement with DCF to keep Williams away from Ayden.